this genus has grown, robust techniques have become
available for marking and manipulating stem cells in this
group and important genomic tools have been developed,
including a fully sequenced genome for S. mediterranea
(reviewed in [1]). Smaller research communities have
also begun working on the stem cell biology of the
macrostomid Macrostomum lignano and, most recently,
the acoel Isodiametra pulchra. Collectively, these studies
are beginning to reveal the generalities as well as the
unique properties of this similar neoblast stem-cell
system employed in different animal groups.